Using Chi-Square Tests
Grade 12th Grade · Science · 45 min· Ap Bio
What's Included
Learning Objective
I can apply the chi-square test to analyze observed and expected data.
Warm-Up Video
Bozeman Science · 11:53
Chi-squared Test
Guided Notes
3 key concepts
- 1
The Chi-squared (χ²) test is used to determine if the variation in data is due to chance or a specific variable being tested.
- 2
The null hypothesis states there is no statistical difference between observed and expected values; this hypothesis is either accepted or rejected based on whether the calculated χ² value exceeds the critical value.
- 3
Degrees of freedom are calculated as the number of outcomes minus one, and the critical value is found on a chart, typically using a p-value of 0.05.
Practice Questions
7 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“In an experiment, you expect to see 50% purple flowers and 50% white flowers. You observe 60 purple and 40 white flowers. Calculate the χ² value. Show your work.”
Complete Lesson Package
Get all 3 ready-to-use resources:
